Rotor assembly, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a rotor assembly, a motor, a compressor and refrigeration equipment, and the rotor assembly comprises a rotor body, the rotor body is provided with multiple poles which are arranged at intervals in the circumferential direction, and an air groove is formed between at least two adjacent poles; each pole of the rotor is provided with a magnetic steel groove, and the magnetic steel groove comprises a first groove extending in the direction perpendicular to the radius direction, and a second groove and a third groove which are located at the two ends of the first groove and extend in the direction away from the circle center in the radial direction. The magnets are respectively accommodated in the first groove, the second groove and the third groove; wherein two adjacent poles on the rotor are symmetrical about a Q axis, one pole on the rotor is symmetrical about a D axis, the distance between the intersection point of the outer edge of the rotor and the Q axis and the D axis is L1, the distance between the end part of the second groove and the D axis is L2, and L2 / L1 is larger than or equal to 0.75 and smaller than or equal to 0.85, so that the output torque of the motor can be improved, and the efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor assembly, a motor, a compressor, and a refrigeration device. Background Art

[0002] In actual applications, permanent magnet motors currently have a prominent problem of high losses, which will greatly reduce the efficiency of the motor.

[0003] Specifically, permanent magnet motors (PMMs) can generate various types of losses during operation, including iron loss, copper loss, and mechanical loss, due to various factors. Iron loss primarily consists of hysteresis loss and eddy current loss in the core. This causes a significant amount of energy to be dissipated during operation, preventing it from being effectively converted into useful mechanical output. This reduces the motor's efficiency. This not only increases energy consumption and operating costs but can also impact the motor's performance stability and service life. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a rotor assembly that can increase the output torque of a motor and improve efficiency.

[0005] According to an embodiment of the present application, a rotor assembly includes: a rotor body, wherein the rotor body is provided with multiple poles spaced apart in the circumferential direction, and an air slot is formed between at least two adjacent poles; each pole of the rotor is formed with a magnetic steel slot, and the magnetic steel slot includes a first slot extending perpendicular to the radial direction and a second slot and a third slot located at both ends of the first slot and extending radially away from the center of the circle; a magnet, wherein the magnet is respectively accommodated in the first slot, the second slot and the third slot; wherein the two adjacent poles on the rotor are symmetrical about the Q axis, and one pole on the rotor is symmetrical about the D axis, the distance between the intersection of the outer edge of the rotor and the Q axis and the D axis is L1, the distance between the end of the second slot and the D axis is L2, and the following conditions are satisfied: 0.75≤L2 / L1≤0.85.

[0006] According to a rotor assembly of an embodiment of the present application, a first slot extending perpendicular to the radial direction and a second slot and a third slot extending radially away from the center of the circle at both ends of the first slot are provided, and magnets are placed in the three slots. The vertical portion of the first slot can make the magnetic field more concentrated in the direction perpendicular to the radius, and the second and third slots extending radially help guide the magnetic field to the outer edge of the rotor, thereby enhancing the magnetic field strength on the rotor surface. This slot structure can guide the magnetic field generated by the magnet to gather along the direction of the slot and reduce the divergence of the magnetic field. The magnetic concentration effect increases the air gap flux density between the rotor and the stator. An air slot is formed between at least two adjacent poles, and the air slot can isolate the influence of the magnetic field between each pole. According to the principle of the motor, the increase in the air gap flux density can directly improve the torque output capacity of the motor. Under the same current input, the motor can generate greater torque and improve efficiency.

[0007] According to the rotor assembly of some embodiments of the present application, the distance between the end of the first slot and the D-axis is L3 and satisfies: 0.25≤L3 / L2≤1.

[0008] According to the rotor assembly of some embodiments of the present application, the distance between the first slot and the center of the rotor is D1, the outer diameter of the rotor is R1, and the following relationship is satisfied: 0.453≤D1 / R1≤0.824.

[0009] According to the rotor assembly of some embodiments of the present application, a communication port communicating with the air groove is formed on the outer edge of the rotor.

[0010] According to the rotor assembly of some embodiments of the present application, the outer end of the communication port extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D2≤D3, 0≤D3≤R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0011] According to the rotor assembly of some embodiments of the present application, the outer end of the communication port extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D3≤D2, 0≤D2≤R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0012] According to the rotor assembly of some embodiments of the present application, the air slot is configured as a trapezoidal slot whose width gradually decreases in a direction away from the center of the circle.

[0013] According to the rotor assembly of some embodiments of the present application, the minimum distance between the outer edge of the air slot and the center of the circle is R2, and satisfies: 0≤R2-D1≤0.88×(R1-D1), D1≤R2.

[0014] The following briefly describes the motor according to an embodiment of the present application.

[0015] The motor according to the embodiment of the present application includes the rotor assembly described in any of the above embodiments. Since the rotor assembly described in any of the above embodiments is provided on the motor according to the present embodiment, the motor according to the present application can increase the air gap magnetic flux density of the motor due to the rotor structure that can concentrate magnetic flux. The increase in magnetic flux will increase the output torque of the motor. When the torque increases, if the motor speed remains unchanged or increases, the output power of the motor will also increase accordingly, so that the motor can be used in occasions that require high torque starting and operation, such as cranes, elevators and other equipment, to ensure that it can operate stably under heavy loads. The higher output power enables the motor to complete more work in the same time, improves work efficiency, and is suitable for industrial production and other fields with high power requirements.

[0016] The following briefly describes the compressor according to an embodiment of the present application.

[0017] The compressor according to an embodiment of the present application includes the motor described in any of the above embodiments. Since the compressor according to this embodiment is provided with the motor described in any of the above embodiments, the compressor according to this application provides a stable power source for the compressor due to the motor's high torque output and smooth operation. During the operation of the compressor, the stable torque and power input can ensure the continuity and stability of the compression process, improve the compression efficiency of the compressor, enable the compressor to process more gas per unit time, and thus improve the operating efficiency of the entire compression system.

[0018] The following briefly describes the refrigeration equipment according to the embodiment of the present application.

[0019] The refrigeration equipment according to the embodiment of the present application includes the compressor described in any of the above embodiments. Since the compressor described in any of the above embodiments is provided on the refrigeration equipment according to the present embodiment, the refrigeration equipment according to the present application can compress the refrigerant more efficiently because the compressor has a higher compression efficiency. In the refrigeration cycle, the efficient compression process can make the refrigerant absorb more heat in the evaporator, thereby increasing the cooling capacity, and the refrigeration equipment can reach the set refrigeration temperature in a shorter time. For example, in an air conditioner, the indoor temperature can be quickly reduced, and in a refrigerator, the food can be made to reach the refrigeration or freezing temperature faster, and less electricity is consumed while achieving the same refrigeration effect. This can significantly reduce the operating costs for refrigeration equipment that runs for a long time (such as commercial freezers, central air-conditioning systems, etc.).

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 Schematic diagram of the structure of the rotor assembly according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 A in the middle is an enlarged structural diagram;

[0024] Figure 3 A schematic diagram of the structure of the combined superposition of the first rotor punching sheet and the second rotor punching sheet;

[0025] Figure 4 This is a schematic diagram of the structure of the alternating stacking of the first rotor punching and the second rotor punching.

[0026] Reference numerals:

[0027] 100. Rotor assembly;

[0028] 1. Rotor body; 11. Air slot; 12. Magnetic steel slot;

[0029] 121, first slot; 122, second slot; 123, third slot;

[0030] 2. First rotor punching sheet; 3. Second rotor punching sheet; 4. Connecting port. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0032] Hereinafter, a rotor assembly 100 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0033] like Figure 1-4As shown, a rotor assembly 100 according to an embodiment of the present application includes a rotor body 1 and a magnet, the rotor body 1 is provided with multiple poles spaced apart in the circumferential direction, and an air slot 11 is formed between at least two adjacent poles; each pole of the rotor is formed with a magnetic steel slot 12, the magnetic steel slot 12 includes a first slot 121 extending perpendicular to the radial direction and a second slot 122 and a third slot 123 located at both ends of the first slot 121 and extending radially away from the center of the circle, and the magnets are respectively accommodated in the first slot 121, the second slot 122 and the third slot 123; wherein the two adjacent poles on the rotor are symmetrical about the Q axis, and one pole on the rotor is symmetrical about the D axis, the distance between the intersection of the outer edge of the rotor and the Q axis and the D axis is L1, the distance between the end of the second slot 122 and the D axis is L2, and the following conditions are satisfied: 0.75≤L2 / L1≤0.85.

[0034] First, since the two adjacent poles on the rotor are symmetrical about the Q axis, during the operation of the motor, this symmetrical structure makes the magnetic field more uniform and symmetrical in spatial distribution. The uniform magnetic field can reduce the torque fluctuation during the operation of the motor, thereby making the motor run more smoothly and reducing vibration and noise.

[0035] Secondly, the magnetic steel slot 12 is composed of a first slot 121 extending perpendicular to the radial direction and a second slot 122 and a third slot 123 located at both ends of the magnetic steel slot in the radial direction. The magnets are respectively accommodated in these slots. The vertical part of the first slot 121 makes the magnetic field more concentrated in the direction perpendicular to the radius. The second and third slots are designed along the radial direction to guide the magnetic field to the outer edge of the rotor, thereby enhancing the magnetic field strength on the rotor surface. This slot design can guide the magnetic field generated by the magnet to gather along the direction of the slot and reduce the divergence of the magnetic field. An air slot 11 is formed between at least two adjacent poles. The air slot 11 can isolate the influence of the magnetic field between each pole. The air gap flux density between the rotor and the stator is increased, which can improve the torque output capacity of the motor and generate greater torque under the same current input. It also helps to improve the power factor of the motor, reduce reactive power loss, and realize miniaturization and lightweight of the motor.

[0036] Then, when the magnet is in a changing magnetic field, according to the law of electromagnetic induction, an induced electromotive force is generated inside the magnet, forming eddy currents and generating resistance losses. In this rotor structure, the magnet slots 12 in each pole separate the magnets, blocking the eddy current flow path. Moreover, the segmented magnet structure makes the induced electromotive force generated by each segment of the magnet independent of each other when the magnetic field changes, reducing the circulating current that may be formed in large-area magnets and reducing eddy current losses. The multi-pole design and the air slots 11 between adjacent poles increase the magnetic resistance, reduce the coupling of the magnetic field between the magnets, and reduce the generation of induced electromotive force. This can improve the efficiency of the motor, reduce the heating of the magnets, maintain the stability of the magnetic properties of the magnets, and extend the service life of the motor.

[0037] The air slots 11 between adjacent poles on the rotor body 1 increase the contact area between the rotor surface and the air. This larger contact area facilitates heat dissipation. Good heat dissipation prevents excessive rotor temperatures, magnet demagnetization, and winding insulation aging, thereby improving motor reliability and service life. This makes it suitable for motors with high power densities or long continuous operation. Furthermore, the air slots 11 effectively block the magnetic flux path within the rotor core. According to the law of electromagnetic induction, this reduces the formation of eddy currents, lowering eddy current losses and improving motor efficiency.

[0038] It should be noted that since the distance between the intersection of the outer edge of the rotor and the Q axis and the D axis is L1, L1 is only related to the rotor radius of the rotor. In the embodiment of the present application, since the rotor radius remains unchanged on the same axis, only L2 is a variable. The shape of the magnetic steel slot 12 remains unchanged, and one pole on the rotor is symmetrical about the D axis. Therefore, L2 / L1 can be further understood as a reflection of the area of ​​the magnetic steel slot 12. The smaller the ratio of L2 / L1, the smaller the area occupied by the magnetic steel slot 12 in the area surrounded by the two Q axes. Conversely, the larger the ratio of L2 / L1, the larger the area occupied by the magnetic steel slot 12 in the area surrounded by the two Q axes. In the embodiment of the present application, L2 / L1 needs to be less than or equal to 0.85. This is because an air slot 11 is formed between at least two adjacent poles. The function of the air slot 11 is to block If the air slots 11 are too small, the magnetic flux flow path in the rotor core cannot be blocked, affecting the motor's operating efficiency. At the minimum effective size of the air slots 11, when the end of the second slot 122 is close to the edge of the air slot 11, the value of L2 / L1 is 0.85. L2 / L1 needs to be greater than or equal to 0.75 because if the area occupied by the magnetic steel slots 12 within the area bounded by the two Q axes is too small, the volume of the magnets that can be accommodated in this area will also be reduced. A smaller magnet volume will result in insufficient magnetic field strength, reducing the motor's output capacity. By ensuring that L2 / L1 is greater than or equal to 0.75, the magnetic steel slots 12 occupy an appropriate proportion of the area bounded by the two Q axes, thereby accommodating a sufficient volume of magnets and ensuring a sufficiently strong magnetic field. This helps increase the motor's torque and ensures sufficient power output during startup and operation.

[0039] like Figure 1-2 As shown, according to the rotor assembly 100 in some embodiments of the present application, the distance between the end of the first slot 121 and the D axis is L3 and satisfies: 0.25≤L3 / L2≤1.

[0040] It can be understood that one pole on the rotor is symmetric about the D axis. Then, L3 / L2 can be understood as the opening size of the figure formed by the first slot 121, the second slot 122, and the third slot 123. The smaller the value of L3 / L2, the larger the opening. Conversely, the larger the value of L3 / L2, the smaller the opening. When the value of L3 / L2 is 1, the shape of the magnet slot 12 is a "U" shape, and the second slot 122 and the third slot 123 are both perpendicular to the first slot 121. Since the second and third slots are designed radially to guide the magnetic field towards the outer edge of the rotor, but when L3 / L2 is greater than 1, it will show a closing state. In this case, the path for the second slot 122 and the third slot 123 to guide the magnetic field towards the outer edge of the rotor will be blocked. The closing will make the distribution of the magnetic field in the area near the slot opening uneven, resulting in distortion and concentration of the magnetic field when passing through the closing part, and it cannot smoothly guide along the direction of the slot to the outer edge of the rotor. This will cause the magnetic field intensity and distribution near the outer edge of the rotor not to meet the expected design requirements, unable to increase the air-gap magnetic flux density between the rotor and the stator, and affecting the performance of the motor. Therefore, L3 / L2 needs to be ensured to be less than or equal to 1.

[0041] L3 / L2 needs to be greater than or equal to 0.25 to ensure the effective length of the first magnet. If L3 / L2 is too small, the length of the first magnet will be too short. A too short magnet length will result in insufficient magnetic flux generated. Insufficient magnetic flux will directly affect the torque output ability and overall performance of the motor. Moreover, the too short first magnet may not be able to effectively cooperate with the magnets in the second slot 122 and the third slot 123,破坏磁路的完整性,使得磁场在磁钢槽12内的分布无法达到最优状态。保证L3 / L2大于0.25可以确保第一磁钢具有足够的有效长度。这有助于维持足够的磁通量,提高电机的转矩输出,保证电机在不同工况下都能有良好的性能表现。同时,足够的第一磁钢长度有利于构建完整、高效的磁路,使磁场在转子组件100内的分布更加合理,提高电机的效率和功率密度。

[0042] As Figure 1-2 shown, for the rotor assembly 100 according to some embodiments of the present application, the distance between the first slot 121 and the center of the rotor is D1, and the outer diameter of the rotor is R1, and it satisfies: 0.453 ≤ D1 / R1 ≤ 0.824.

[0043] It should be noted that there seems to be an incorrect expression "破坏磁路的完整性,使得磁场在磁钢槽12内的分布无法达到最优状态。" in the translation of , which should be corrected to a more accurate and fluent description according to the specific context. The above translation is for reference only.It is understood that D1 / R1 can be understood as the positional relationship between the first slot 121 on the rotor and the rotor center. Since the rotor's outer diameter R1 is a constant, a larger D1 / R1 value indicates that the first slot 121 is further away from the rotor center, while a smaller D1 / R1 value indicates that the first slot 121 is closer to the rotor center. When D1 / R1 is greater than 0.824, it means that the first slot 121 is farther away from the rotor center and closer to the rotor edge. Harmonics are inevitably generated during motor operation. Harmonic magnetic fields create complex magnetic field variations in areas near the rotor surface. According to the principle of electromagnetic induction, this rapidly changing magnetic field induces high-frequency eddy currents in the conductive parts of the rotor (such as the iron core). First slots 121 that are too close to the rotor surface make the surrounding conductive materials more susceptible to the harmonic magnetic field because they are closer to the harmonic source. These induced eddy currents flow in the conductive material and, due to the inherent resistance of the material, generate heat, resulting in increased losses. Preventing the first slot 121 from being too close to the rotor surface can reduce the impact of harmonics. This can reduce the generation of eddy currents, thereby reducing losses caused by them. This helps improve the efficiency of the motor and reduce energy waste, significantly reducing operating costs, especially during long-term motor operation. At the same time, if the first slot 121 is too close to the rotating surface, the length of the second slot 122 and the third slot 123 will become very short due to the geometric limitations of the rotor structure. The magnets in the second slot 122 and the third slot 123 need a certain slot length to diffuse the magnetic field of the magnet in the first slot 121. Excessively short second and third slots do not provide sufficient space for the magnets to form an effective magnetic field diffusion path, resulting in the magnetic field generated by the magnet in the first slot 121 not being able to fully diffuse into the surrounding space, affecting the uniformity and intensity of the magnetic field distribution throughout the rotor assembly 100. By limiting D1 / R1 to no more than 0.824, the second slot 122 and the third slot 123 are ensured to be of sufficient length to effectively diffuse the magnetic field of the magnet in the first slot 121, making the magnetic field more evenly distributed and more reasonably sized within the rotor assembly 100, thereby improving motor performance, reducing torque fluctuations, and ensuring smoother motor operation.

[0044] If the value of D1 / R1 is too small, that is, the first slot 121 is close to the center of the rotor, the magnetic field generated by the magnet in the first slot 121 will undergo a significant change in the magnetic circuit path due to the long distance and the large change in the magnetic field path when it reaches the outer edge of the rotor. Some magnetic field lines will deviate from the originally expected path and cannot effectively participate in energy conversion through the air gap between the rotor and the stator, but will leak out from other parts of the magnetic circuit. This leaked magnetic field cannot be effectively utilized, resulting in an increase in magnetic leakage. By keeping D1 / R1 greater than or equal to 0.453 and preventing the first slot 121 from being too close to the center of the rotor, magnetic leakage can be effectively reduced. This allows more magnetic field energy to participate in the energy conversion process of the motor, improves the utilization efficiency of the magnetic field, and thus improves the output power and efficiency of the motor and reduces unnecessary waste of energy.

[0045] like Figure 1-2 As shown, according to the rotor assembly 100 of some embodiments of the present application, a communication port 4 communicating with the air slot 11 is formed on the outer edge of the rotor.

[0046] Because a connecting port 4 is formed on the outer edge of the rotor that is connected to the air slot 11, the magnetic field lines that may have originally caused leakage magnetic flux near the edge of the rotor have a new flow path. According to the distribution law of the magnetic field, these magnetic field lines can enter the air slot 11 through the connecting port 4 instead of leaking to the outside world. This changes the distribution of the magnetic field, allowing more magnetic field to be confined inside the rotor assembly 100, thereby effectively reducing leakage magnetic flux. Reducing leakage magnetic flux can improve the effective utilization rate of the magnetic field, thereby improving the output torque and efficiency of the motor, allowing the motor to generate more useful work under the same input power.

[0047] The presence of the communication port 4 facilitates smoother interaction between the air slot 11 and the external magnetic field. The external magnetic field can be coordinated with the rotor's internal magnetic field through the communication port 4, thereby making the magnetic field more evenly distributed inside and outside the rotor assembly 100. A uniform magnetic field distribution helps reduce torque fluctuations and improve the stability of motor operation. Furthermore, the optimized magnetic field distribution can reduce the occurrence of localized magnetic fields that are too strong or too weak, reduce the additional losses caused by an uneven magnetic field, and further improve the efficiency of the motor.

[0048] like Figure 1-2 As shown, according to the rotor assembly 100 of some embodiments of the present application, the outer end of the communication port 4 extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port 4 is connected to the air slot 11 and has a width of D3, and satisfies: D2≤D3, 0≤D3≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0049] It should be noted that R1×acrsin(L1 / R1) refers to the arc length corresponding to L1 at the outer edge of the rotor.

[0050] R1×acrsin(L2 / R1) refers to the arc length of L2 at the outer edge of the rotor.

[0051] 2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] refers to the length between the poles.

[0052] Since D2≤D3 is satisfied, the structural design of the connecting port 4 with a narrow outer end and a wide inner end allows the magnetic field to be gradually constrained during the transmission process from the inner end to the outer end. This structure can better guide the magnetic field through the connecting port 4 into the air slot 11, and prevent the magnetic field from leaking outward at the connecting port 4. At the same time, the limitation of 0≤D3≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] ensures that the width of the inner end of the connecting port 4 is within the length range between the poles, so that the adjustment of the magnetic field is carried out within a reasonable area, and the overall distribution of the magnetic field will not be destroyed because the connecting port 4 is too large or too small. It is conducive to controlling leakage magnetic flux, making the magnetic field more concentratedly distributed in the effective area inside the rotor assembly 100, and improving the utilization efficiency of the magnetic field. Through this structural design, leakage magnetic flux can be effectively reduced and the output torque and efficiency of the motor can be improved.

[0053] like Figure 1-2 As shown, according to the rotor assembly 100 of some embodiments of the present application, the outer end of the communication port 4 extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port 4 is connected to the air slot 11 and has a width of D3, and satisfies: D3≤D2, 0≤D2≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

[0054] When D3≤D2, the communication port 4 presents a structure with a wide outer end and a narrow inner end, which is conducive to guiding the external magnetic field into the air slot 11 more efficiently. Since the outer end is wider, it can receive more external magnetic fields, and as the magnetic field is transmitted inward, the gradually narrowing structure can play a certain role in concentrating the magnetic field and reducing the leakage of the magnetic field during transmission. The same 0≤D2≤2×R1×[acrsin(L1 / R1)-acrsin(L2 / R1)] restriction ensures that the width of the outer end of the communication port 4 is within a specific arc length range between the poles. This allows the guidance and concentration of the magnetic field to be carried out within a reasonable spatial range, avoiding the influence of the magnetic field distribution effect due to the excessive or too small size of the communication port 4. Effectively control the leakage flux and improve the utilization efficiency of the magnetic field, thereby increasing the output torque and efficiency of the motor.

[0055] like Figure 1-2 As shown, according to the rotor assembly 100 of some embodiments of the present application, the air slot 11 is configured as a trapezoidal slot whose width gradually decreases in a direction away from the center of the circle.

[0056] Because the air slots 11 are constructed as trapezoidal slots with a gradually decreasing width away from the center, this shape allows the magnetic field to be confined within a gradually shrinking space as it passes through. Due to the characteristics of the magnetic field, the magnetic field lines become more concentrated in a shrinking space, thus concentrating the magnetic field. Furthermore, the trapezoidal slot structure guides the magnetic field in a specific direction, concentrating it more closely within the rotor's effective area and increasing its strength.

[0057] When the magnetic field changes, an induced electromotive force is generated in the conductor, thereby forming eddy currents. In the rotor assembly 100, the trapezoidal air slots 11 increase the magnetic resistance and reduce the coupling of the magnetic field between the magnets. This makes the magnetic field changes inside the magnets relatively smaller, thereby reducing the generation of induced electromotive force. At the same time, the special structure of the trapezoidal slots changes the distribution path of the magnetic field, making the flow path of the eddy current more complicated, hindering the formation and flow of eddy currents, thereby reducing eddy current losses. Reducing eddy current losses can improve the efficiency of the motor and reduce energy loss. At the same time, it reduces the heat generation of the magnets, helps to maintain the stability of the magnetic properties of the magnets, and extends the service life of the motor.

[0058] like Figure 1-2 As shown, according to the rotor assembly 100 of some embodiments of the present application, the minimum distance between the outer edge of the air slot 11 and the center is R2, and satisfies: 0≤R2-D1≤0.88×(R1-D1), D1≤R2.

[0059] It can be understood that R2-D1 is the distance difference between the first slot 121 and the outer edge of the air slot 11 along the radial extension direction. The smaller the distance difference, the closer the distance between the first slot 121 and the air slot 11 in the radial extension direction. Since D1≤R2, it means that the outer edge of the air slot 11 is farther away from the center of the rotor than the first slot 121. R1-D1 is the distance between the first slot 121 and the outer edge of the rotor.

[0060] When the value of R2-D1 is close to 0.88×(R1-D1), the air slot 11 has enough space in the radial extension direction to block the magnetic field. A larger air slot 11 can form a more obvious magnetic resistance, blocking the flow path of the magnetic field in the rotor core, thereby effectively blocking the magnetic field. In terms of reducing eddy currents, a larger air slot 11 space can reduce the degree of coupling of the magnetic field in the rotor core. According to the law of electromagnetic induction, this will reduce the generation of induced electromotive force, thereby reducing the formation of eddy currents. If R2-D1 exceeds 0.88×(R1-D1), the air slot 11 space is insufficient and cannot effectively block the magnetic field and reduce magnetic field coupling, and eddy current losses will increase. By limiting R2-D1 to no more than 0.88×(R1-D1), it is ensured that the air slot 11 can effectively block the magnetic field and reduce eddy currents. This helps to improve the efficiency of the motor, reduce energy loss, reduce core heating, and improve the reliability and stability of the motor.

[0061] When R2-D1 is equal to 0, the distance between the outer edge of the air slot 11 and the center of the rotor is equal to the distance between the first slot 121 and the center of the rotor. When R2-D1 ≥ 0, it is ensured that the outer edge of the air slot 11 is not closer to the center of the rotor than the first slot 121. From the perspective of space utilization, if the distance between the air slot 11 and the center of the rotor is greater than the distance between the first slot 121 and the center of the rotor, unnecessary space will be wasted in the limited space inside the rotor. This will weaken the strength of the rotor structure and affect the structural compactness of the entire rotor assembly 100. During the operation of the motor, a loose structure may lead to increased mechanical vibration, reduced fitting accuracy between components, and other problems, thereby affecting the performance and reliability of the motor. By limiting R2-D1 to be greater than or equal to 0, the internal space of the rotor can be more reasonably utilized and the compactness of the structure can be maintained. This helps to improve the stability of the motor operation, reduce mechanical vibration and noise, and at the same time improve the fitting accuracy between components, thereby improving the overall performance of the motor.

[0062] like Figure 3-4 As shown, according to some embodiments of the present application, the rotor body 1 of the rotor assembly 100 includes a first rotor punching 2 and a second rotor punching 3. The difference between the first rotor punching 2 and the second rotor punching 3 is only that a connecting port 4 connected to the air groove 11 is formed on the first rotor punching 2, while the second rotor punching 3 does not have the above-mentioned connecting port 4. The rotor body 1 is formed by overlapping the first rotor punching 2 and the second rotor punching 3.

[0063] It is possible that a plurality of second rotor punchings 3 are arranged on both sides, a plurality of first rotor punchings 2 are arranged in the middle section, and the combination of the first rotor punchings 2 and the second rotor punchings 3 is overlapped.

[0064] Alternatively, a first rotor punching 2 is provided first, and then a second rotor punching 3 is provided, and so on, with the last piece being the first rotor punching 2, and the first rotor punchings 2 and the second rotor punchings 3 being alternately stacked.

[0065] It should be noted that the presence of a communication port 4 on the first rotor sheet 2, which communicates with the air slot 11, effectively alters the distribution path of the magnetic field. Based on the principle of magnetic field propagation, the communication port 4 provides an additional channel for the magnetic field to flow, allowing the magnetic field that might otherwise leak to the outside to enter the air slot 11 through the communication port 4, thereby reducing magnetic flux leakage.

[0066] When several first rotor laminations 2 are arranged in the middle section, this structure can effectively reduce magnetic flux leakage in key areas. Because the middle section is typically where the magnetic field is most concentrated and complex, the first rotor laminations 2 can better optimize the magnetic field distribution there. When alternately stacked, the first rotor laminations 2 are evenly distributed throughout the rotor body 1, effectively controlling magnetic flux leakage at all locations throughout the rotor and ensuring efficient utilization of the magnetic field within the rotor.

[0067] The second rotor punching 3 does not have a connecting opening 4, and its structure is relatively complete, which can provide better mechanical support. When several second rotor punchings 3 are arranged on both sides, the mechanical strength of the rotor as a whole at the edge is enhanced. In the case of alternating overlap, the second rotor punchings 3 are inserted between the first rotor punchings 2, compensating for the insufficient mechanical strength of the first rotor punchings 2 caused by the opening. Due to the presence of the second rotor punchings 3, the entire rotor body 1 can better withstand and disperse stress when subjected to external forces (such as centrifugal force generated by high-speed rotation, mechanical vibration, etc.), avoiding structural damage due to local stress concentration.

[0068] The following briefly describes the motor according to an embodiment of the present application.

[0069] The motor according to the embodiment of the present application includes the rotor assembly 100 of any of the above-mentioned embodiments. Since the rotor assembly 100 of any of the above-mentioned embodiments is provided on the motor according to the present embodiment, the motor according to the present application can increase the air gap magnetic flux density of the motor due to the rotor structure that can concentrate magnetic flux. The increase in magnetic flux will increase the output torque of the motor. When the torque increases, if the motor speed remains unchanged or increases, the output power of the motor will also increase accordingly, so that the motor can be applied to occasions requiring high torque starting and operation, such as cranes, elevators and other equipment, to ensure that it can operate stably under heavy loads. The higher output power enables the motor to complete more work in the same time, improves work efficiency, and is suitable for industrial production and other fields with high power requirements.

[0070] The following briefly describes the compressor according to an embodiment of the present application.

[0071] The compressor according to an embodiment of the present application includes the motor of any of the above-described embodiments. Since the compressor according to this embodiment is provided with the motor of any of the above-described embodiments, the compressor according to this application provides a stable power source for the compressor due to the motor's high torque output and smooth operation. During the operation of the compressor, the stable torque and power input can ensure the continuity and stability of the compression process, improve the compression efficiency of the compressor, enable the compressor to process more gas per unit time, and thus improve the operating efficiency of the entire compression system.

[0072] The following briefly describes the refrigeration equipment according to the embodiment of the present application.

[0073] The refrigeration equipment according to the embodiment of the present application includes the compressor of any of the above embodiments. Since the refrigeration equipment according to the present embodiment is provided with the compressor of any of the above embodiments, the refrigeration equipment according to the present application can compress the refrigerant more efficiently because the compressor has a higher compression efficiency. In the refrigeration cycle, the efficient compression process can make the refrigerant absorb more heat in the evaporator, thereby increasing the cooling capacity, and the refrigeration equipment can reach the set refrigeration temperature in a shorter time. For example, in an air conditioner, the indoor temperature can be quickly reduced, and in a refrigerator, the food can be made to reach the refrigeration or freezing temperature faster, and less electricity is consumed while achieving the same refrigeration effect. This can significantly reduce the operating costs for refrigeration equipment that runs for a long time (such as commercial freezers, central air-conditioning systems, etc.).

[0074] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0075] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0076] In the description of this application, “plurality” means two or more.

[0077] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0078] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0079] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: include: a rotor body, the rotor body being provided with a plurality of poles spaced apart in a circumferential direction, with an air slot being formed between at least two adjacent poles; Each pole of the rotor is formed with a magnetic steel slot, wherein the magnetic steel slot includes a first slot extending perpendicular to the radial direction and a second slot and a third slot located at both ends of the first slot and extending radially away from the center of the circle; magnets, the magnets are respectively accommodated in the first slot, the second slot and the third slot; wherein The two adjacent poles on the rotor are symmetrical about the Q axis, and one pole on the rotor is symmetrical about the D axis. The distance between the intersection of the outer edge of the rotor and the Q axis and the D axis is L1, and the distance between the end of the second slot and the D axis is L2, and the following is satisfied: 0.75≤L2 / L1≤0.

85.

2. The rotor assembly according to claim 1, wherein: A distance between the end of the first groove and the D-axis is L3 and satisfies: 0.25≤L3 / L2≤1.

3. The rotor assembly according to claim 1, wherein: The distance between the first slot and the center of the rotor is D1, the outer diameter of the rotor is R1, and the following relationship is satisfied: 0.453≤D1 / R1≤0.

824.

4. The rotor assembly according to claim 1, wherein: A communication port communicating with the air groove is formed on the outer edge of the rotor.

5. The rotor assembly according to claim 4, wherein: The outer end of the communication port extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D2≤D3, 0≤D3≤R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

6. The rotor assembly according to claim 4, wherein: The outer end of the communication port extends to the outer edge of the rotor and has a width of D2, the inner end of the communication port is connected to the air slot and has a width of D3, and satisfies: D3≤D2, 0≤D2≤R1×[acrsin(L1 / R1)-acrsin(L2 / R1)].

7. The rotor assembly according to claim 3, wherein: The air groove is configured as a trapezoidal groove whose width gradually decreases in a direction away from the center of the circle.

8. The rotor assembly according to claim 7, wherein: The minimum distance between the outer edge of the air groove and the center of the circle is R2, and satisfies: 0≤R2-D1≤0.88×(R1-D1), D1≤R2.

9. A motor, characterized in that: A rotor assembly comprising any one of claims 1 to 8.

10. A compressor, characterized in that: Including the motor according to claim 9.

11. A refrigeration device, characterized in that: Including the compressor according to claim 10.

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